Verb lengthen has 2 senses
  1. lengthen - make longer; "Lengthen this skirt, please"
    --1 is one way to
    increase
    Antonyms: shorten
    Sample sentence:
    They lengthen the cape
  2. lengthen - become long or longer; "In Spring, the days lengthen"
    --2 is one way to
    grow
    Antonyms: shorten
    Sample sentence:
    Something ----s
,
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